Product Description:

The P21NRFB-LNN-NS-00 is a hybrid stepper motor built by Pacific Scientific for the POWERMAX II P Motors series. In automated positioning systems, it converts pulsed electrical commands into incremental mechanical rotation, allowing indexers, pick-and-place heads, and small conveyors to reach precise stop points without external feedback. Standard construction, a single smooth shaft, and NEMA mounting dimensions support straightforward installation in compact motion axes.

With a holding torque of 0.79 Nm, the motor can maintain load position when power is applied. The frame size is NEMA 23, and the body length is 52.4 mm, giving the unit a mass of 0.68 kg for compact layouts. Each full step advances the rotor by 1.8 degrees, producing 200 steps per revolution with ±1.5% accuracy, which suits lead-screw drives that require fine repeatability. Phase windings labeled type B have an inductance of 1.1 mH and a resistance of 0.64 Ω, and these values affect current rise time and heating under pulse-width-modulated drive signals. The rated phase current is 4.6 A, delivered through eight flying leads in a regular lead-wire connection style. A single rotor stack, a standard rotor design, and a 6.35 mm shaft diameter allow axial loads up to 60 N and radial loads up to 90 N without exceeding bearing limits.

Rotor inertia is 0.000012 kg·m², which supports rapid acceleration under moderate load. Continuous service is permitted from -20 °C to +40 °C, and surface temperature may reach 95 °C before derating is required. The winding system uses Class B insulation rated to 130 °C, with a 500 VDC dielectric test, 100 MΩ insulation resistance, and a 340 VDC voltage rating. The housing has an IP23 rating, which is suitable for dry indoor machinery enclosures, while the smooth single-ended shaft and regular lead-wire exit help simplify coupling and cable routing.